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st: Heckman selection estimates

From   Renuka Metcalfe <[email protected]>
To   statalist <[email protected]>
Subject   st: Heckman selection estimates
Date   Thu, 6 Dec 2007 14:55:40 +0000 (GMT)

Dear Statalisters

I am using a cross-section data and the variables are
not continuous. Heckman ML estimates provides some of
the following 

             coeff    z stat
/athrho      -.098   -0.24

/insigma   -2.41    -59.62
                  Robust Standard error
rho       -0.097   0.399
sigma     0.089   0.0036
lambda    -0.0087 0.0359

When I estimated the Heckman twostep I get some of the
         coeff   z stat
lambda   -0.067   0.4607
                 Robust standard error
rho     -0.647 
sigma 0.10
lambda -0.067   0.460

I would be grateful if you would let me know how one
would best interpret the significance of the above
results. If you need further information please let me

Many thanks

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